Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.16-3.433.25-3.50
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal, Fibrous
Cleavage
{110} Good, {110} Good
{001} perfect and {100} imperfect
Mohs Hardness
5-66-7
2
10
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Chemical Composition
(Ca,Na)(Mg,Fe,Al)Si 2O 6Anthony et al , Handbook of Mineralogy (2001)
CaAl 2(Fe3+ ,Al)Si 3O 12(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references